lawson



2 SheetsSheet 1.

(No Model.)

S. LAWSON.

VALVE FOR GAS ENGINES.

No. 433,246. Patented July 29, 1890 aegumumun I (No Model.) 2Sheets-Sheet 2.

S. LAWSON. VALVE FOR GAS ENGINES.

No. 433,246. Patented July 29, 1890.

UNITED STATES PATENT OFFICE.

SAMUEL LAXVSON, OF NEW YORK, N. Y., ASSIGNOR TO HIMSELF AND ALONZO T.XVELCH, OF SAME PLACE.

VALVE FO R GAS-ENG l N ES.

SPECIFICATION forming part of Letters Patent No. 433,246, dated July 29,1890.

Application filed January 4, 1890. Serial No. 335,893. (No model.)

To all whom it may concern; place, and Fig. 8 shows the face of thevalve Be it known that I, SAMUEL LAWSON, a nearly in the positioncorresponding to Fig.7. citizen of the United States, residing at theReferring to Fig. l and to my before-mencity and State of New York, haveinvented tioned patent, the cylinder A is represented an Improvement inValves for Gas-Engines, as supported by a suitable base or frame G, 5 ofwhich the following is a specification. and the piston C is within thecylinder A This valve is especially adapted to gas-enand provided with aconnecting-rod D to the gines of a character similar to thatrepresentcrank E of the main shaft F, and upon this ed in my patent, No.402,751, granted May 7, main shaft F is a pinion 23, gearing into a I01889, and in which there is a piston recipro- Wheel 2st of twice thediameter, and there'is 6o cated within a cylinder and acting upon a acam at K, that serves to open and close the connecting-rod and crank torevolve a tlyexhaust valve or slide at- H at the proper wheel, and intowhich the air and gas are time, and there is a connecting-rod 'i from adrawn upon the downward movement of the crank-pin on the gear-wheel24,thatgives mopiston. The supply is shut off as the piston tion to thevalve L. 0 rises, and the ignition of the air and gas takes In mypresent improvements, however, the place as soon as the crank turns itscenter valve is circular and oscillated by the action upon the upstroke,so as to act forcibly upon of the connecting-rod i upon the arm I, thatthe parts in accelerating the movement of the extends out from the arboror axis 2 of the piston and fiywheel upon the second downvalve L, whichvalve Lis circular and is stroke, and upon the second upstroke thewithin a valve-case L, and in consequence spent gases are forced out,and upon the secof the wheel 21 making one revolution to two 0nddownstroke the air and gases are drawn revolutions of the shaft F thevalve L rein again and the operations repeated as beceives a completemovement, first in one di- 2 5 fore. rection and then in the other,every two strokes 7 5 I make use of a peculiar circular valve to of thepiston C. This valve-case L has a which a reciprocating movement isgiven, port 8 to the cylinder A, and it has a port 9, first in onedirection and then in the other, through which air and gas are drawn atthe to admit the air and gas to the cngine-cylinproper time from thepipe 10, supplying gas,

0 der and to admit air and gas into the ignitand the pipe 11, supplyingair. These coming-chamber in the valve, so that at the mingle as theypass through the port 9 into proper moment, when the crank has turnedthe valve and from there into the cylinder the center on the upstroke,the ignited gases A, as hereinafter described. in the chamber of thevalve will ignite the The valve L is cylindrical and partially 3 5 gasesin the cylinder of the engine to insure hollow, having two chambers 13and 1% therea perfect explosion in such cylinder. in, and there are twoports 15 16 to the cham- In the drawings, Figure 1 is a diagram repber14, and there are two ports 17 18 to the resenting the engine andconnections for movchamber 13, and adjacent to the port 18 there ing thevalve. Fig. 2 is an elevation of the is a port 19 through the valve-caseL, adja- 4o valve-chest. Fig. 3 is a vertical section of cent to thegas-burner or other flame at 20, 0 the same at the line a: a: of Figs. 4and 5. and in the valve L is a segmental port 22, Fig. at is anelevation of the valve-chest with opening into the chamber 13, and inthe valvethe valve removed. Fig. 5 is an elevation of case there is a1101c or port :26 from the port the face of the valve as the same wouldap- 8, passing down and terminating at the open- 45 pear if turned overfrom the position it would ing 27 in the valve-seat, and there is agasoccupy when inserted into the valve-case. pipe 28 with a tubularpassage terminating Fig. (5 is a section of the valve and case at the atthe opening 20 in the valve-seat, and there line y 3 Fig. 3. Fig. 7 isan elevation of the is a tubular passage from the outside to thevalve-case and a section of the valve in the opening 30 in thevalve-seat to let in air, as

50 position it occupies when the explosion takes hereinafter described.IDO

Commencing now with the parts in the position represented in Fig. 6 andpresuming that the piston O is descending, the air and gas are drawn inthrough the ports 9 and 15, through the chamber 14, and by the ports 16and 8 to the cylinder A, and the valve moves progressively in thedirection of the arrow 31 until the port 16 coincides with the port 8,and then it commences to move in the opposite direction, indicated bythe arrow 32. During this period the hole 30 and the port 18 coincideand the hole 29 and port 22 coincide, and the port 17 has uncovered thehole 27 hence the suction action of the descendin g piston causes anyspent gases in the chamber 13 to be drawn out through the hole 27, thatleads into the port 8, and at the same time gas is entering the chamber13 by the opening 29 and air is entering the same chamber by the pipe30, and this operation continues without any loss of gas, because theair and gas from the chamber 13 pass into the cylinder A, thus entirelyfreeing the chamber 13 from spent gases.

During the movement of the valve in the direction indicated by the arrow32 the airinlet 30 is first closed, (see Fig. 6,) and then the .hole 27is closed, and immediately thereafter the port 16 passes away from theport 8, closing thelatter, and this operation takes place as the crank Eturns its center, when the piston C is at its extreme downward movementand commences to rise, and in so doing the gases contained in thecylinder A are compressed, and during the upward movement of the pistonO the valveLhas been continuing its motion in the direction of the arrow32 and gas has continued to flow in by the opening 29 and segmental port22 into the chamber 13, and the further movement causes the port 7 17 ofthe valve to correspond to the port 19,

is rendered reliable, because the gases in the cylinder A are underpressure and expand from the port 8 into the chamber 13, that is filledwith flame; and it is to be understood that the port 18 opens to theport 8 immediately after the crank E has passed the center on theupstroke, and the valve continues its motion in the direction of thearrow 32 until the port 18 coincides with the port 8, and then itimmediately commences to move in the opposite direction, as indicated bythe arrow 31, and these movements take place during the downstroke ofthe piston O, and the parts are so timed that the valve H is opened asthe piston C commences to rise; hence the spent gases are ejected fromthe cylinder, and by the time the piston 0 reaches its extreme upwardmovement the valve L has continued to move in the direction of the arrow31 until it approaches the position indicated in Fig. (3 to again admitair and gas by the ports 16 and 8 as soon as the piston C commences todescend.

I claim as my inven'tion 1. The combination, with the piston andcylinder having a port 8 in a gas-engine, of the circular valve-casehaving the ports 9 and 19 and the openings 29, 30, and 27, and acircular valve within the valve=case having the chambers 13 and let andthe respective ports opening into such chambers, substantially as setforth.

2. The combination, with the valve-chest in a gas-engine, of a circularvalve within the valve-chest, having a chamber 14:, and ports throughwhich air and gas are admitted to the engine, and a chamber 13 forcontaining gas that is ignited, ports leading to such chamber 13, forthe admission of gas, and a port or opening leading from suchflame-chamber to the cylinder-port, so that spent gases may be withdrawnfrom the flame-chamber into the cylinder of the engine, there being aport in the valve-chest to admit the flame from a burner to theflame-chamber of the valve, substantially as set forth.

Signed by me this 20th day of December, 1889.

SAMUEL LAWSON.

Witnesses:

Gno. '1. PINCKNEY, WILLIAM G. Mom.

